Lactobacillus plantarum strain ATG-K2, ATG-K6 or ATG-K8, and composition for preventing or treating vaginitis comprising same

ABSTRACT

A novel Lactobacillus plantarum strain ATG-K2, ATG-K6 or ATG-K8 and a composition for the prevention or treatment of vaginitis containing the same are proposed. The Lactobacillus plantarum strain ATG-K2, ATG-K6 or ATG-K8 has excellent antimicrobial effects against various pathogenic strains as well as Candida albicans and Gardnerella vaginalis, which are vaginitis pathogens, and thus can be easily used as a composition for the treatment of bacterial vaginosis, vaginal candidiasis, etc., or as a functional health food for the prevention or amelioration of these diseases.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a National Stage of International Application No. PCT/KR2019/006936 filed Jun. 10, 2019, claiming priority based on Korean Patent Application No. 10-2018-0121634 filed Oct. 12, 2018, the entire disclosures of which are incorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to a novel Lactobacillus plantarum strain ATG-K2, ATG-K6 or ATG-K8 and a composition for preventing or treating vaginitis containing the same.

BACKGROUND ART

Vaginitis is an inflammatory disease occurring in the female urogenital system, and vaginitis may be broadly classified into infectious and non-infectious forms, and it is not easy to self-diagnose the cause of the onset before accurate medical analysis. Typical symptoms of vaginitis include odor, excessive secretion, increased pH, inflammatory swelling, erythema, skin cracking and the like (Morris et al., 2001; Egan and Lipsky, 2002). Among these, the breakdown of infectious vaginitis is expected to be 40-50% of bacterial vaginosis, 25-25% of vaginal candidiasis, and 15-20% of trichomonal vaginitis (Sobel, 1997; Egan and Lipsky, 2002). In general, treatment is attempted with antibiotics, antifungal agents or combined oral administration or direct administration to the affected area, depending on the cause of the infection. In infectious vaginitis, Gardnerella vaginalis is the main microorganism causing bacterial vaginosis, and Candida albicans is the main microorganism causing vaginal candidiasis. The critical pathogenesis of these infectious diseases is that the amount of lactobacilli capable of producing hydrogen peroxide is decreased in the vagina due to various causes such as excessive antibiotics, stress, primary vaginitis caused by internal factors, and the like, and eventually, direct disinfection by hydrogen peroxide and production of lactic acid from lactobacilli are significantly reduced, thus increasing the pH, creating an environment in which various bacteria easily grow (Sobel, 1997). Hence, lactic-acid bacteria capable of lowering the pH again are added, and in particular, supplementation with lactic-acid bacteria having the ability to produce hydrogen peroxide is regarded as an important method in the improvement in female genital health.

Therefore, the inventors of the present disclosure have performed various studies on methods of reducing vaginitis using lactic-acid bacteria, and have ascertained that a novel Lactobacillus plantarum strain ATG-K2, ATG-K6 or ATG-K8 has antimicrobial effects against a variety of vaginitis pathogens and has superior immunity-enhancing efficacy, thus culminating in the present disclosure.

CITATION LIST Patent Literature

-   (Patent Document 1) Korean Patent No. 10-1750468 (Title: Composition     comprising Lactobacillus fermentum MG901 or Lactobacillus plantarum     MG989, Applicant: Mediogen Co. Ltd., et al., Registration date: Jun.     19, 2017) -   (Patent Document 2) Korean Patent No. 10-1098241 (Title:     Lactobacillus sp. HY7801 having inhibitory effect against urinary     tract infection and candidiasis, and products containing the same as     effective component, Applicant: Korea Yakult Co. Ltd., Registration     date: Dec. 19, 2011) -   (Patent Document 3) Korean Patent No. 10-1860513 (Title:     Pharmaceutical composition for preventing or treating candidal     colpitis comprising Lactobacillus salivarius MG242 isolated from     human vagina, Applicant: Mediogen Co. Ltd., et al., Registration     date: May 16, 2018) -   (Patent Document 4) Korean Patent No. 10-1784847 (Title: A     composition comprising lactic-acid bacteria for protecting and     treating vaginosis disease and the use thereof, Applicant:     Haudongchun Co. Ltd., Registration date: Sep. 28, 2017)

Non-Patent Literature

-   (Non-Patent Document 1) Aslim B., Onal D., Beyatli Y. 2007. Factors     influencing autoaggregation and aggregation of Lactobacillus     delbrueckii subsp. bulgaricus isolated from handmade yogurt. J. Food     Protec. 70:223-227. -   (Non-Patent Document 2) Begley M., Hill C., Gahan CGM. 2006. Bile     salt hydrolase activity in probiotics. Appl Environ Microbiol     72:1729-1738. -   (Non-Patent Document 3) Bover-Cid S., Holzapfel W. H. 1999. Improved     screening procedure for biogenic amine production by lactic-acid     bacteria. Int. J. Food Microbiol. 53:33-41. -   (Non-Patent Document 4) Dashkevicz M. P., Feighner S. D. 1989.     Development of a differential medium for bile salt hydrolase-active     Lactobacillus spp. Appl. Envrion. Microbiol. 55:11-16. -   (Non-Patent Document 5) de Vries M. C., Vaughan E. E., Kleerebezem     M., de Vos W. M. 2006. Lactobacillus plantarum—survival, functional     and potential probiotic properties in the human intestinal tract.     Int. Dairy J. 16: 1018-1028. -   (Non-Patent Document 6) EFSA Panel on Additives and Products or     Substances used in Animal Feed (FEEDAP). 2012. Guidance on the     assessment of bacterial susceptibility to antimicrobials of human     and veterinary importance. EFSA Journal 10(6):2740. -   (Non-Patent Document 7) Egan M., Lipsky M. S. 2002. Vaginitis: case     reports and brief review. AIDS Patient Care STDS 16:367-373. -   (Non-Patent Document 8) Fielding C. A., MacLoughlin R. M., McLeod     L., Colmont C. S., Najdovska M., Grail D., et al. 2008. IL-6     regulates neutrophil trafficking during acute inflammation via     STAT3. J. Immunol. 181:2189-2195. -   (Non-Patent Document 9) Fiorentino D. F., Zlotnik A., Mosmann T. R.,     Howard M., O'Garra. 1991. IL-10 inhibits cytokine production by     activated macrophages. J. Immunol. 147:3815-3822. -   (Non-Patent Document 10) Handley P. S., Harty D. W. S., Wyatt J. W.,     Brown C. R., Doran J. P., Gibbs A. C. 1987. A comparison of the     adhesion, coaggregation and cell-surface hydrophobicity properties     of fibrillary and fimbriate strains of Streptococcus salivarius. J.     Gen. Microbiol. 133:3207-3217. -   (Non-Patent Document 11) McGroarty J. A., Tomeczek L., Pond D. G.,     Reid G., Bruce A. W. 1992. Hydrogen peroxide production by     Lactobacillus species: correlation with susceptibility to the     spermicidal compound nonoxynol-9. J. Infect. Diseases 165:1142-1144. -   (Non-Patent Document 12) Morris M., Nicoll A., Simms I., Wilson J.,     Catchpole M. 2001. Bacterial vaginosis: a public health review.     Br. J. Obstet. Gynaecol. 108:439-450. -   (Non-Patent Document 13) Scheller J., Chalaris A., Schmidt-Arras D.,     Rose-John S. 2001. The pro- and anti-inflammatory properties of the     cytokine interleukin-6. Biochim. Biophys. Acta 1813(5):878-888. -   (Non-Patent Document 14) Sobel J. D. 1997. Vaginitis. N. Engl. J.     Med. 337:1896-1903. -   (Non-Patent Document 15) Vujanovic N. L. 2011. Role of TNF     superfamily ligands in innate immunity. Immunol. Res. 50:159-174.

DISCLOSURE Technical Problem

An objective of the present disclosure is to provide a novel Lactobacillus plantarum strain ATG-K2, ATG-K6 or ATG-K8, and a composition for the prevention or treatment of vaginitis containing the same.

Technical Solution

The present disclosure pertains to Lactobacillus plantarum ATG-K2 (Accession number: KCTC 13577BP), Lactobacillus plantarum ATG-K6 (Accession number: KCTC 13570BP) or Lactobacillus plantarum ATG-K8 (Accession number: KCTC 13571BP), all of which have antimicrobial activity against at least one vaginitis pathogen selected from Candida albicans and Gardnerella vaginalis.

The Lactobacillus plantarum ATG-K2, Lactobacillus plantarum ATG-K6 or Lactobacillus plantarum ATG-K8 has antimicrobial activity against at least one bacterium selected from the group consisting of Staphylococcus aureus, Listeria monocytogenes, Streptococcus mutans, Streptococcus salivarius, Escherichia coli, Pseudomonas aeruginosa, and Cronobacter sakazakii.

The Lactobacillus plantarum ATG-K2, Lactobacillus plantarum ATG-K6 or Lactobacillus plantarum ATG-K8 does not cause hemolysis and does not produce at least one biogenic amine selected from the group consisting of histamine, tyramine, putrescine, and cadaverine.

The Lactobacillus plantarum ATG-K2, Lactobacillus plantarum ATG-K6 or Lactobacillus plantarum ATG-K8 has bile salt hydrolase activity, and also has the ability to produce hydrogen peroxide or antioxidant activity.

The Lactobacillus plantarum ATG-K2, Lactobacillus plantarum ATG-K6 or Lactobacillus plantarum ATG-K8 is not resistant to at least one antibiotic selected from the group consisting of ampicillin, vancomycin, gentamicin, kanamycin, streptomycin, clindamycin, erythromycin, tetracycline, and chloramphenicol.

The Lactobacillus plantarum ATG-K2, Lactobacillus plantarum ATG-K6 or Lactobacillus plantarum ATG-K8 has innate immune activity that increases the amount of at least one cytokine selected from among IL-6 (interleukin-6) and TNF-α (tumor necrosis factor-α), and has anti-inflammatory activity that increases the amount of IL-10 (interleukin-10).

The present disclosure pertains to a pharmaceutical composition for the treatment or amelioration of vaginitis containing the Lactobacillus plantarum ATG-K2, Lactobacillus plantarum ATG-K6 or Lactobacillus plantarum ATG-K8.

The present disclosure provides a functional health food for the prevention or amelioration of vaginitis containing the Lactobacillus plantarum ATG-K2, Lactobacillus plantarum ATG-K6 or Lactobacillus plantarum ATG-K8.

The strain of the present disclosure may be cultured in an MRS liquid or solid medium (broth or agar), and in the MRS broth, Lactobacillus plantarum K2 may be cultured to a concentration of about 5×10⁸ CFU/ml, Lactobacillus plantarum K6 may be cultured to a concentration of about 3×10⁹ CFU/ml, and Lactobacillus plantarum K8 may be cultured to a concentration of about 3×10⁹ CFU/ml.

These strains are preferably cultured at 30 to 37° C. for 16 to 48 hr, and the optimal culture temperature is 37° C., the minimum culture temperature is 15° C., the maximum culture temperature is 38° C., the optimal culture pH is 6.5, the minimum culture pH is 4.0, and the maximum culture pH is 7.8. The optimal culture time is 16 hr, the minimum culture time is 10 hr, and the maximum culture time is 120 hr.

In addition, the present disclosure provides a pharmaceutical composition for the prevention or treatment of vaginitis containing the novel Lactobacillus plantarum strain ATG-K2, ATG-K6 or ATG-K8. The novel Lactobacillus plantarum strain ATG-K2, ATG-K6 or ATG-K8 may be added in an amount of 0.001 to 30 wt % to the pharmaceutical composition of the present disclosure.

The pharmaceutical composition may be formulated into oral dosage forms, such as powders, granules, tablets, capsules, suspensions, emulsions, syrups, and aerosol formulations, as well as formulations for external use, suppositories, and the like, in accordance with typical individual processes. A carrier, an excipient and a diluent, which may be contained in the pharmaceutical composition, may include lactose, dextrose, sucrose, sorbitol, mannitol, xylitol, erythritol, maltitol, starch, acacia rubber, alginate, gelatin, calcium phosphate, calcium silicate, cellulose, methylcellulose, microcrystalline cellulose, polyvinylpyrrolidone, water, methylhydroxybenzoate, propylhydroxybenzoate, talc, magnesium stearate and mineral oil. The formulation may be typically prepared using a diluent or excipient such as a filler, an extender, a binder, a wetting agent, a disintegrant, a surfactant, and the like. A solid formulation for oral administration may include tablets, pills, powders, granules, capsules, and the like, and such a solid formulation may be prepared by mixing the strain of the present disclosure with at least one excipient, for example, starch, calcium carbonate, sucrose, lactose, gelatin, and the like. In addition to a simple excipient, lubricants such as magnesium stearate, talc and the like may be used. An oral liquid formulation may include suspensions, solutions, emulsions, syrups, and the like, and may also include not only simple diluents, such as water or liquid paraffin, but also various excipients, for example, wetting agents, sweeteners, fragrances, preservatives, and the like. A formulation for parenteral administration may include sterilized aqueous solutions, non-aqueous solvents, suspensions, emulsions, lyophilized preparations, suppositories, and vaginal suppositories. As non-aqueous solvents or suspension agents, propylene glycol, polyethylene glycol, vegetable oil such as olive oil, injectable esters such as ethyl oleate and the like may be used. As the base of a suppository, Witepsol, Macrogol, Tween 61, cacao butter, laurin fat, glycerogelatin and the like may be used.

The amount of the pharmaceutical composition according to the present disclosure, when administered, may vary depending on the age, gender and weight of the subject to be treated, the particular disease or pathological condition for treatment, the severity of the disease or pathological condition, the administration route, and the judgment of the prescriber. A dose determination based on these factors will be easily made by those skilled in the art, and the dose typically falls in the range of 0.01 mg/kg/day to about 2000 mg/kg/day. Preferably, the dose is set to the range of 1 mg/kg/day to 500 mg/kg/day. The administration may be carried out once a day or several times a day. The dose does not in any way limit the scope of the present disclosure.

The pharmaceutical composition according to the present disclosure may be administered to mammals such as mice, livestock, humans, and the like through various routes. Since the strain of the present disclosure has little toxicity and minimal side effects, it is a drug that may be safely used even when taken for a long time for prophylactic purposes.

In addition, the present disclosure provides a functional health food for the prevention or amelioration of vaginitis containing the novel Lactobacillus plantarum strain ATG-K2, ATG-K6 or ATG-K8. The Lactobacillus plantarum strain ATG-K2, ATG-K6 or ATG-K8 may be added in an amount of 0.001 to 50 wt % to the functional health food of the present disclosure. The functional health food of the present disclosure is provided in forms such as tablets, capsules, pills or liquids, and examples of the food to which the strain of the present disclosure may be added include various drinks, meats, sausages, breads, candies, snacks, noodles, ice creams, dairy products, soups, electrolytic beverages, drinking water, alcoholic beverages, gums, teas, and vitamin complexes.

Advantageous Effects

The present disclosure pertains to a novel Lactobacillus plantarum strain ATG-K2, ATG-K6 or ATG-K8, and a composition for the prevention or treatment of vaginitis containing the same, and the Lactobacillus plantarum strain ATG-K2, ATG-K6 or ATG-K8 has excellent antimicrobial effects against various pathogenic strains as well as Candida albicans and Gardnerella vaginalis, which are vaginitis pathogens, and thus can be easily used as a composition for the treatment of bacterial vaginosis, vaginal candidiasis, etc., or as a functional health food for the prevention or amelioration of these diseases.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 shows the results of comparison of 16S rRNA sequences of each of the Lactobacillus plantarum K2 (1079-1378 of SEQ ID NO: 1), K6 (1081-1380 of SEQ ID NO: 2) and K8 (1081-1380 of SEQ ID NO: 3) strains of the present disclosure;

FIG. 2 shows the results of confirmation of heat resistance of each of the Lactobacillus plantarum K2, K6 and K8 strains of the present disclosure;

FIGS. 3A and 3B show the results of confirmation of hemolysis of each of the Lactobacillus plantarum K2, K6 and K8 strains of the present disclosure (FIG. 3) and the results of production of biogenic amine thereby (FIG. 3B);

FIGS. 4A, 4B and 4C show the results of confirmation of bile salt hydrolase activity (FIG. 4A), ability to produce hydrogen peroxide (FIG. 4B) and antioxidant activity (FIG. 4C) of each of the Lactobacillus plantarum K2, K6 and K8 strains of the present disclosure;

FIGS. 5A, 5B, 5C and 5D show the results of confirmation of the activity of each of the Lactobacillus plantarum K2, K6 and K8 strains of the present disclosure on inhibiting the growth of Candida albicans KCTC7678 (CA) (FIG. 5A), the activity thereof on inhibiting the growth of Gardnerella vaginalis KCTC5096 (GV) (FIG. 5B), the coaggregation thereof on Candida albicans KCTC7678 (CA) (FIG. 5C), and the coaggregation thereof on Gardnerella vaginalis KCTC5096 (GV) (FIG. 5D);

FIGS. 6A, 6B, 6C and 6D show the results of coculture of each of the Lactobacillus plantarum K2, K6 and K8 strains of the present disclosure with Candida albicans KCTC7678 (CA) (FIG. 6A and FIG. 6B) and the results of coculture thereof with Gardnerella vaginalis KCTC5096 (GV) (FIG. 6C and FIG. 6D);

FIGS. 7A and 7B show the effect of enhancing innate immunity (increased IL-6 and TNF-α levels) by each of the Lactobacillus plantarum K2, K6 and K8 strains of the present disclosure; and

FIG. 8 shows the effect of inhibiting inflammation (increased IL-10 level) by each of the Lactobacillus plantarum K2, K6 and K8 strains of the present disclosure.

MODE FOR DISCLOSURE

A better understanding of the present disclosure will be obtained through the following examples. However, the present disclosure is not limited to these examples, and may be embodied in other forms. These examples are provided to thoroughly explain the disclosure and to sufficiently transfer the spirit of the present disclosure to those skilled in the art.

Example 1. Preparation of Lactic-Acid Bacteria and Infectious Microorganisms

The lactic-acid bacteria that were used were Lactobacillus plantarum ATG-K2 (K2), Lactobacillus plantarum ATG-K6 (K6), and Lactobacillus plantarum ATG-K8 (K8), which are new microorganisms isolated from kimchi samples in the Chungcheong region, Korea in January 2016. The bacteria used in the antimicrobial test were seven types of infectious or opportunistic bacteria, including Staphylococcus aureus KCTC1621 (SA), Escherichia coli KCTC1682 (EC), Pseudomonas aeruginosa KCTC2004 (PA), Listeria monocytogenes KCTC3569 (LM), Cronobacter sakazakii KCTC2949 (CS), Streptococcus mutans KCTC3065 (SM), and Streptococcus salivarius ATG-P1 (SS). As for vaginitis pathogens, Candida albicans KCTC7678 (CA) was used as a fungal model, and Gardnerella vaginalis KCTC5096 (GV) was used as a bacterial model. Lactic-acid bacteria were cultured in an MRS (Difco Laboratories, USA) agar or broth medium, and bacteria other than GV were cultured in a BHI (Brain Heart Infusion, Difco Laboratories, USA) agar or broth medium. GV was inoculated into a BHI agar or broth medium containing 20% of heat-treated horse serum (Gibco, USA), followed by anaerobic culture using an Oxoid™ AnaeroGen™ system (Oxoid, UK). CA was cultured in a YM (Difco Laboratories, USA) agar or broth medium. All microorganisms were subjected to stationary culture at 37° C. for about 20 hr.

Example 2. Confirmation of Physiological Properties of Lactic-Acid Bacteria Example 2-1. Identification of 16S rRNA Sequence of Lactic-Acid Bacteria

For molecular biological identification, the 16S rRNA sequencing of lactic-acid bacteria K2, K6 and K8 strains isolated from kimchi was performed by Solgent (Daejeon). Using 27F (5′-AGA GTT TGA TCC TGG CTC AG-3′; SEQ ID NO: 4), 518F (5′-CCA GCA GCC GCG GTA ATA C-3′; SEQ ID NO: 5), 907R (5′-CCG TCA ATT CMT TTR AGT TT-3′; SEQ ID NO: 6), and 1492R (5′-GGT TAC CTT GTT ACG ACT T-3′; SEQ ID NO: 7) as primers for sequencing, nucleotide sequence reading was performed a total of four times, and the contigs obtained through nucleotide sequence alignment of each reading were analyzed using a BLAST online tool (hypertext transfer protocol: blast.ncbi.nlm.nih.gov/Blast.cgi) of the National Center for Biotechnology Information (NCBI). Using Clustal Omega (hypertext transfer protocol: www.ebi.ac.uk/Tools/msa/clustalo) of EMBL-EBI, the differences in 16S rRNA sequences between the K2, K6 and K8 strains were analyzed.

Based on the results of 16S rRNA sequencing, respective strains are confirmed to have the nucleotide sequences of SEQ ID NOS: 1 to 3 below, and as shown in FIG. 1, the nucleotide sequences of three types of strains were identical to Lactobacillus plantarum, and when the nucleotide sequences of K2, K6 and K8 strains were compared, it appeared that one nucleotide was different between the nucleotide sequences (FIG. 1).

SEQ ID NO: 1: Lactobacillus_plantarum_ATG- K2_16S_rRNA_sequence_partial TAGGCGGCTGGTTCCTAAAAGGTTACCCCACCGACTTTGGGTGTTACAAA CTCTCATGGTGTGACGGGCGGTGTGTACAAGGCCCGGGAACGTATTCACC GCGGCATGCTGATCCGCGATTACTAGCGATTCCGACTTCATGTAGGCGAG TTGCAGCCTACAATCCGAACTGAGAATGGCTTTAAGAGATTAGCTTACTC TCGCGAGTTCGCAACTCGTTGTACCATCCATTGTAGCACGTGTGTAGCCC AGGTCATAAGGGGCATGATGATTTGACGTCATCCCCACCTTCCTCCGGTT TGTCACCGGCAGTCTCACCAGAGTGCCCAACTTAATGCTGGCAACTGATA ATAAGGGTTGCGCTCGTTGCGGGACTTAACCCAACATCTCACGACACGAG CTGACGACAACCATGCACCACCTGTATCCATGTCCCCGAAGGGAACGTGT AATCTCTTAGATTTGCATAGTATGTCAAGACCTGGTAAGGTTCTTCGCGT AGCTTCGAATTAAACCACATGCTCCACCGCTTGTGCGGGCCCCCGTCAAT TCCTTTGAGTTTCAGCCTTGCGGCCGTACTCCCCAGGCGGAATGCTTAAT GCGTTAGCTGCAGCACTGAAGGGCGGAAACCCTCCAACACTTAGCATCAT CGTTTACGGTATGGACTACCAGGGTATCTAATCCTGTTTGCTACCCATAC TTTCGAGCCTCAGCGTCAGTTACAGACCAGACAGCCGCCTTCGCCACTGG TGTTCTTCCATATATCTACGCATTTCACCGCTACACATGGAGTTCCACTG TCCTCTTCTGCACTCAAGTTTCCCAGTTTCCGATGCACTTCTTCGGTTGA GCCGAAGGCTTTCACATCAGACTTAAAAAACCGCCTGCGCTCGCTTTACG CCCAATAAATCCGGACAACGCTTGCCACCTACGTATTACCGCGGCTGCTG GCACGTAGTTAGCCGTGGCTTTCTGGTTAAATACCGTCAATACCTGAACA GTTACTCTCAGATATGTTCTTCTTTAACAACAGAGTTTTACGAGCCGAAA CCCTTCTTCACTCACGCGGCGTTGCTCCATCAGACTTTCGTCCATTGTGG AAGATTCCCTACTGCTGCCTCCCGTAGGAGTTTGGGCCGTGTCTCAGTCC CAATGTGGCCGATTACCCTCTCAGGTCGGCTACGTATCATTGCCATGGTG AGCCGTTACCTGACCATCTAGCTAATACGCCGCGGGACCATCCAAAAGTG ATAGCCGAAGCCATCTTTCAAACTCGGACCATGCGGTCCAAGTTGTTATG CGGTATTAGCATCTGTTTCCAGGTGTTATCCCCCGCTTCTGGGCAGGTTT CCCACGTGTTACTCACCAGTTCGCCACTCACTCAAATGTAAATCATGATG CAAGCACCAATCAATACCACACTTCGTTCGACTTGCATGTATTAGGCACG CCGCCAGCGTTCGTCCTGAGCCATGTCCAAA SEQ ID NO: 2: Lactobacillus_plantarum_ATG- K2_16S_rRNA_sequence_partial CTTAGGCGGCTGGTTCCTAAAAGGTTACCCCACCGACTTTGGGTGTTACA AACTCTCATGGTGTGACGGGCGGTGTGTACAAGGCCCGGGAACGTATTCA CCGCGGCATCCTGATCCGCGATTACTAGCGATTCCGACTTCATGTAGGCG AGTTGCAGCCTACAATCCGAACTGAGAATGGCTTTAAGAGATTAGCTTAC TCTCGCGAGTTCGCAACTCGTTGTACCATCCATTGTAGCACGGTGTAGCC CAGGTCATAAGGGGCATGATGATTTGACGTCATCCCCACCTTCCTCCGGT TTGTCACCGGCAGTCTCACCAGAGTGCCCAACTTAATGCTGGCAACTGAT AATAAGGGTTGCGCGTCGTTGCGGGACTTAACCCAACATCTCACGACACG AGCTGACGACAACCATGCACCACCTGTATCCATGTCCCCGAAGGGAACGT CTAATCTCTTAGATTTGCATAGTATGTCAAGACCTGGTAAGGTTCTTCGC GTAGCTTCGAATTAAACCACATGCTCCACCGCTTGTGCGGGCCCCCGTCA ATTCCTTTGATTTTCAGCCTTGCGGCCGTACTCCCCAGGCGGAATGCTTA ATGCGTTAGCTGCAGCACTGAAGGGCGGAAACCCTCCAACACTTAGCATT CATCGTTTACGGTATGGACTACCAGGGTATCTAATCCTGTTTGCTACCCA TACTTTCGAGCCTCAGCGTCAGTTACAGACCAGACAGCCGCCTTCGCCAC TGGTGTTCTTCCATATATCTACGCATTTCACCGCTACACATGGAGTTCCA CTGTCCTCTTCTGCACTCAAGTTTCCCAGTTTCCGATGCACTTCTTCGGT TGAGCCGAAGGCTTTCACATCAGACTTAAAAAACCGCCTGCGCTCGCTTT ACGCCCAATAAATCCGGACAACGCTTGCCACCTACGTATTACCGCGGCTG CTGGCACGTAGTTAGCCGTGGCTTTTGGTTAAATACCGTCAATACCTGAA CAGTTACTCTCAGATATGTTCTTCTTAACAACAGAGTTTTACGAGCCGAA ACCCTTCTTCACTCACGCGGCGTTGCTCCATCAGACTTTCGTCCATTGTG GAAGATTCCCTACTGCTGCCTCCCGTAGGAGTTGGGCCGTGTCTCAGTCC CAATGTGGCCGATTACCCTCTCAGGTCGGCTACGTATCATTGCCATGGTG AGCCGTTACCCCACCATCTAGCTAATACGCCGCGGGACCATCCAAAAGTG ATAGCCGAAGCCATCTTTCAAGCTCGGACCATGCGGTCCAAGTTGTTATG CGGTATTAGCATCTGTTTCCAGGTGTTATCCCCCGCTTCTGGGCAGGTTT CCCACGTGTTACTCACCAGTTCGCCACTCACTCAAATGTAAATCATGATG CAAGCACCAATCAATACCAGAGTTCGTTCGACTTGCATGTATTAGGCACG CCGCCAGCGTTCGTCCTGAGC SEQ ID NO: 3: Lactobacillus_plantarum_ATG- K8_16S_rRNA_sequence_partial CTTAGGCGGCTGGTTCCTAAAAGGTTACCCCACCGACTTTGGGTGTGGAC AAACTCTCATGGTGTGACGGGCGGTGTGTACAAGGCCCGGGAACGTATTC ACCGCGGCATGCTGATCCGCGATTACTAGCGATTCCGACTTCATGTAGGC GAGTTGCAGCCTACAATCCGAACTGAGAATGGCTTTAAGAGATTAGCTTA CTCTCGCGAGTTCGCAACTCGTTGTACCATCCATTGTAGCACGTGTGTAG CCCAGGTCATAAGGGGCATGATGATTTGACGTCATCCCCACCTTCCTCCG GTTTGTCACCGGCAGTCTCACCAGAGTGCCCAACTTAATGCTGGCAACTG ATAATAAGGGTTGCGCTCGTTGCGGGACTTAACCCAACATCTCACGACAC GAGCTGACGACAACCATGCACCACCTGTATCCATGTCCCCGAAGGGAACG TCTAATCTCTTAGATTTGCATAGTATGTCAAGACCTGGTAAGGTTCTTCG CGTAGCTTCGAATTAAACCACATGCTCCACCGCTTGTGCGGGCCCCCGTC AATTCCTTTGAGTTTCAGCCTTGCGGCCGTACTCCCCAGGCGGAATGCTT AATGCGTTAGCTGCAGCACTGAAGGGCGGAAACCCTCCAACACTTAGCTT CATCGTTTACGGTATGGACTACCAGGGTATCTAATCCTGTTTGCTACCCA TACTTTCGAGCCTCAGCGTCAGTTACAGACCAGACAGCCGCCTTCGCCAC TGGTGTTCTTCCATATATCTACGCATTTCACCGCTACACATGGAGTTCCA CTGTCCTCTTCTGCACTCAAGTTTCCCAGTTTCCGATGCACTTCTTCGGT TGAGCCGAAGGCTTTCACATCAGACTTAAAAAACCGCCTGCGCTCGCTTT ACGCCCAATAAATCCGGACAACGCTTGCCACCTACGTATTACCGCGGCTG CTGGCACGTAGTTAGCCGTGGCTTTCTGGTTAAATACCGTCAATACCTGA ACAGTTACTCTCAGATATGTTCTTCTTTAACAACAGAGTTTTACGAGCCG AAACCCTTCTTCACTCACGCGGCGTTGCTCCATCAGACTTTCGTCCATTG TGGAAGATTCCCTACTGCGCCTCCCGTAGGAGTTTGGGCCGTGTCTCAGT CCCAATGTGGCCGATTACCCTCTCAGGTCGGCTACGTATCATTGCCATGG TGAGCCGTTACCCCACCATCTAGCTAATACGCCGCGGGACCATCCAAAAG TGATAGCCGAAGCCATCTTTCAAACTCGGACCATGCGGTCCAAGTTGTTA TGCGGTATTAGCATCTGTTTCCAGGTGTATCCCCCGCTTCTGGGCAGGTT TCCCACGTGTTACTCACCAGTTCGCCACTCACTCAAATGTAAATCATGAT GCAAGCACCAATCAATACCAGAGTTCGTTCGACTTGCATGTATTAGGCAC GCCGCCAGCGTTCGTCCTGAGCCA

Example 2-2. Confirmation of Sugar Fermentation Pattern Characteristics

An API50 CH test (BioMerieux, France) was conducted in order to investigate identification and characteristics through a sugar fermentation pattern.

Briefly, lactic-acid bacteria that were cultured to purity in 10 ml of an API 50CHL medium (BioMerieux, France) were suspended until an absorbance OD₆₀₀ of about 0.5 was obtained, after which the culture suspension was inoculated into each cupule of an API 50CH test strip and cultured at 37° C. The results of sugar fermentation were confirmed 24, 48, and 72 hr after inoculation, and the results thereof are shown in Table 1 below.

TABLE 1 Lb. plantarum Lb. plantarum Lb. plantarum Carbohydrates ATG-K2 ATG-K6 ATG-K8 Glycerol − − − Erythritol − − − D-Arabinose − − − L-Arabinose − w − Ribose + + + D-Xylose − − − L-Xylose − − − Adonitol − − − Methyl-βD- − − − Xylopyranoside Galactose + + + Glucose + + + Fructose + + + Mannose + + + Sorbose − − − Rhamnose − − − Dulcitol − − − Inositol − − − Mannitol + + + Sorbitol + + + Methyl-αD- − − − Mannopyranoside Methyl-αD- − − − Glucopyranoside N-Acetylglucosamine + + + Amygdalin + + + Arbutin + + + Esculin + + + Salicin + + + Cellobiose + + + Maltose + + + Lactose + + + Melibiose + + + Sucrose + + + Trehalose + + + Inulin − − − Melezitose − + + Raffinose − + − Starch − − − Glycogen − − − Xylitol − − − Gentiobiose W w w Turanose − + + Lyxose − − − Tagatose − − − D-Fucose − − − L-Fucose − − − D-Arabitol − − − L-Arabitol − − − Gluconate W w w 2-keto-glugonate − − − 5-keto-gluconate − − − (+: positive, w: weak positive, −: negative)

With reference to Table 1, in the sugar fermentation pattern based on the APIWEB database provided by BioMerieux, K2 exhibited 52% similarity to Lactobacillus plantarum group 1, K6 exhibited 99.4% similarity to Lactobacillus plantarum group 1, and KB exhibited 99.5% similarity to Lactobacillus plantarum group 1. As for the distinctive sugar fermentation characteristics, K2 and K8 strains did not degrade L-arabinose, whereas K6 appeared dark green, thus indicating low fermentation efficiency (w, weak). K2 did not ferment melezitose or raffinose, K6 fermented both melezitose and raffinose, and K8 fermented only melezitose. The turanose fermentation capacity was manifested in K6 and K8. Based on these results, the differences between the three types of strains for the sugar fermentation pattern were confirmed.

Example 2-3. Confirmation of Heat Resistance

In order to investigate the heat resistance of lactic-acid bacteria of the present disclosure, samples were obtained at 20 sec, 40 sec, 60 sec, and 80 sec while bathing at 70° C. in a water bath, a viable cell count was taken to thus determine resistance to heat, and the results thereof are shown in Table 2 below and in FIG. 2. In Table 2 and in FIG. 2, a viable cell count is represented as a Log₁₀ CFU/ml value, and the number in parentheses represents the viability (%) compared to the initial count. Each result value is the average of three independent experiments.

TABLE 2 Strains Initial 20 sec 40 sec 60 sec Lb. plantarum  8.95 ± 0.03 8.99 ± 0.04 8.92 ± 0.03  8.80 ± 0.03  ATG-K2 (100.00 ± 8.22%) (109.65 ± 9.82%)  (91.33 ± 3.50%) (70.95 ± 6.05%) Lb. plantarum  9.44 ± 0.04 9.43 ± 0.04 9.38 ± 0.05  9.28 ± 0.03  ATG-K6 (100.00 ± 9.86%)  (97.27 ± 8.70%) (87.46 ± 9.76%) (68.88 ± 5.23%) Lb. plantarum  9.55 ± 0.03 9.49 ± 0.05 9.41 ± 0.05  9.41 ± 0.05  ATG-K8 (100.00 ± 4.23%)  (89.67 ± 8.71%) (75.26 ± 6.99%) (74.32 ± 7.74%)

As is apparent from Table 2 and FIG. 2, K8, which has a viability of 74.32% upon heat treatment for 60 sec, exhibited the highest heat resistance, and the next-highest heat resistance was that of K6, having a viability of 68.88%, followed by K2, having a viability of 70.95%. Here, the maximum bacteria concentration capable of growing in the MRS broth for each culture experiment was about 5×10⁸ CFU/ml for K2, about 3×10⁹ CFU/ml for K6, and about 3×10⁹ CFU/ml for K8.

Example 2-4. Confirmation of Hemolysis of Lactic-Acid Bacteria

In order to evaluate the presence or absence of hemolysis of lactic-acid bacteria in relation to safety of probiotics, K2, K6 and K8 strains were inoculated into a tryptic soybean agar (TSA, Difco Laboratories, USA) containing 5% sheep blood, and were then cultured at 37° C. for about 24 to 48 hr.

As a result, as shown in FIG. 3A, there was growth of lactic-acid bacteria K2, K6 and K8, but hemolysis and clear zones due thereto were not observed.

Example 2-5. Confirmation of Biogenic Amine Production by Lactic-Acid Bacteria

Whether or not biogenic amines such as histamine, tyramine, putrescine or cadaverine, which may be harmful to the human body, were produced was tested in accordance with the method suggested by Bover-Cid and Holzapfel (1999). Briefly, after preparing a medium using the components of the test solid medium suggested by Bover-Cid and Holzapfel (1999), each lactic-acid bacteria strain was inoculated and cultured at 37° C. for about 72 hr, and the color change of the medium was observed. If a biogenic amine is present, the pH value around the inoculated bacteria increases due to the action of decarboxylase, and the bromocresol purple reagent contained in the medium turns from yellow to purple.

As a result, as shown in FIG. 3B, there was growth of K2, K6 and K8 even in the solid medium for observing whether or not biogenic amine was synthesized, but there was no color change, indicating that any one biogenic amine among histidine, tyramine, putrescine, and cadaverine was not produced.

Example 2-6. Antibiotic Test

The antibiotic test was performed using E-test strips (BioMerieux, France) of nine types of antibiotics including ampicillin, vancomycin, gentamicin, kanamycin, streptomycin, clindamycin, erythromycin, tetracycline, and chloramphenicol to determine the minimum inhibitory concentration (MIC). Briefly, lactic-acid bacteria to be tested were each suspended to an absorbance OD₆₀₀ of about 0.8 and were then spread on an MRS solid medium using a sterile cotton swab. The solid medium on which the lactic-acid bacteria were spread was dried for about 3 min, and the E-test strip was placed thereon, followed by culture at 37° C. for 48 hr. Here, due to the nature of lactic-acid bacteria, intrinsic resistance to gentamicin, kanamycin and streptomycin, which are aminoglycosides, may occur, and thus, as a test medium for the corresponding antibiotics, a plate-count agar (PCA, Difco Laboratories, USA) or a Mueller-Hinton agar (MHA, Difco Laboratories, USA) was used. For the types of antibiotics and the criteria for the minimum inhibitory concentration that can be considered safe, reference was made to guidelines published by the European Food Safety Authority (EFSA) (EFSA Panel on Additives and Products or Substances used in Animal Feed, 2012). The results of the above experiments are shown in Table 3 below.

TABLE 3 Strains AMP VAN GEN KAN STR CD ERY TET CM Lb. plantarum ATG-K2 0.094 NR 12 12 NR 1 0.25 6 4 Lb. plantarum ATG-K6 0.094 NR 12 16 NR 0.75 0.125 3 2 Lb. plantarum ATG-K8 0.125 NR 16 16 NR 1 0.19 4 0.75

The unit of each numerical value in Table 3 is μg/ml, and each abbreviation is as follows: AMP, ampicillin; VAN, vancomycin; GEN, gentamicin; KAN, kanamycin; STR, Streptomycin; CD, clindamycin; ERY, erythromycin; TET, tetracycline; CM, chloramphenicol; NR, not required.

As is apparent from Table 3, all of the three types of Lactobacillus plantarum strains of the present disclosure met the criteria of the guidelines suggested by EFSA and were thus determined to be safe. Here, the minimum inhibitory concentration was 94-128 μg/ml for VAN and 94-194 μg/ml for STR, but the species Lactobacillus plantarum did not require sensitivity values for VAN and STR based on EFSA, which was represented as NR (not required).

Example 2-7. Confirmation of Antimicrobial Effect of Lactic-Acid Bacteria

In order to confirm the antimicrobial functionality of K2, K6 and K8, the antimicrobial activity of lactic-acid bacteria K2, K6 and K8 against a total of seven types of infectious or opportunistic bacteria, including four types of gram-positive SA, LM, SM, and SS and three types of gram-negative EC, PA, and CS, was determined by measuring clear zones through a disc test. Seven types of bacteria cultured overnight in a BHI plate medium were each suspended in 1× phosphate-buffered saline (PBS) until OD₆₀₀ of about 0.8 was obtained. Each suspension was absorbed with a sterile cotton swab, spread over an agar medium for an antimicrobial activity test for lactic-acid bacteria, in which BHI and MRS were mixed at a ratio of 1:1, and dried for about 3 min. Each 8 mm paper disc (Advantec, Japan) was attached to the dried test agar medium, and 35 μl of each of K2, K6, and K8 solutions cultured in an MRS broth for about 18 to 20 hr was inoculated to the paper disc, dried for about 3 min, cultured at 37° C. and observed. The size of the clear zone formed after culture was determined in a manner in which the diameter thereof was measured and was calculated after subtracting 8 mm, which is the diameter of the paper disc.

Based on the results of measurement of the antimicrobial activity of K2, K6 and K8 against seven types of infectious or opportunistic bacteria, the antimicrobial effects of all the lactic-acid bacteria, tested four times on seven types of target bacteria, were represented as the average value, and the results thereof are shown in Table 4 below, indicating that all strains had antimicrobial effects.

TABLE 4 Strains SA TV SM SS EC PA CS Lb. plantarum ATG-K2 5.00 ± 0.18 5.50 ± 0.18 4.75 ± 0.28 4.13 ± 0.11 3.38 ± 0.21 3.75 ± 0.13 6.50 ± 0.18 Lb. plantarum ATG-K6 4.88 ± 0.21 4.75 ± 0.13 4.13 ± 0.11 3.13 ± 0.11 3.50 ± 0.18 4.00 ± 0.18 6.13 ± 0.11 Lb. plantarum ATG-K8 4.25 ± 0.13 5.18 ± 0.21 3.88 ± 0.11 4.00 ± 0.18 3.50 ± 0.18 3.88 ± 0.11 5.88 ± 0.11

The unit for the diameter of the clear zone, which is each numerical value in Table 4, is mm, and each abbreviation is as follows: Staphylococcus aureus KCTC1621 (SA), Listeria monocytogenes KCTC3569 (LM), Streptococcus mutans KCTC3065 (SM), Streptococcus salivarius ATG-P1 (SS), Escherichia coli KCTC1682 (EC), Pseudomonas aeruginosa KCTC2004 (PA), Cronobacter sakazakii KCTC2949 (CS).

Through such experiments, the stability of K2, K6 and K8 can be confirmed through the absence of hemolysis, the absence of biogenic amine causative of allergy or disease, and the safety related to antibiotic sensitivity, and in consideration of the safety of the genus Lactobacillus plantarum based on common knowledge (de Varies et al., 2006), it can be found that the lactic-acid bacteria of the present disclosure are safe for application to humans.

Example 2-8. Confirmation of Bile Salt Hydrolase (BSH) Activity

In order to confirm the presence or absence of bile salt hydrolase (BSH) activity as the function of each of the lactic-acid bacteria, an experiment was performed in accordance with the method described in Dashkevicz and Feighner (1989). Briefly, an agar medium was prepared by adding 0.5% (w/v) sodium taurocholic acid (TDCA, Sigma-Aldrich, Germany) to MRS. K2, K6 and K8 lactic-acid bacteria were inoculated into the corresponding agar medium, placed in an anaerobic jar, and cultured at 37° C. for about 72 hr, and the results thereof were confirmed.

As shown in FIG. 4A, all of the K2, K6 and K8 lactic-acid bacteria exhibited BSH activity, and the formation of an opaque white hard colony without sediment infiltrating into the periphery, which is a characteristic phenomenon of Lactobacillus plantarum having BSH activity, was observed.

Example 2-9. Confirmation of Ability to Produce Hydrogen Peroxide

For the ability to produce hydrogen peroxide as the function of each of the lactic-acid bacteria, an agar medium was prepared by adding 0.25 mg/ml of tetramethylbenzidine (Sigma-Aldrich, Germany) and 0.01 mg/ml to MRS (McGroarty et al., 1992). Here, the additives were added at about 50° C. after autoclaving of the MRS agar. Each of the lactic-acid bacteria was inoculated into the completely hardened test agar medium, placed in an anaerobic jar, and cultured at 37° C. for about 48-72 hr. After culture, the lactic-acid bacteria were taken out of the anaerobic jar and exposed to air, and the colony and the surrounding color change were observed.

As shown in FIG. 4B, as for the ability to produce hydrogen peroxide, the colony of each of the lactic-acid bacteria and the surface adjacent thereto turned dark blue, indicating that the lactic-acid bacteria K2, K6 and K8 produced hydrogen peroxide.

Example 2-10. Confirmation of Antioxidant Activity

In order to evaluate the antioxidant activity of each of the lactic-acid bacteria strains, a radical-scavenging experiment was conducted using 2,2′-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) (ABTS, Sigma-Aldrich, Germany). Briefly, lactic-acid bacteria were cultured for about 24 hr, allowed to react with lysozyme (Sigma-Aldrich, Germany) for 2 hr at 37° C., and lysed through sonication to obtain each lactic-acid bacteria lysate. The solid content thereof was measured using a water content analyzer, and a stock solution was adjusted to a concentration of 50 mg/ml. To prepare ABTS, 14 mM ABTS stock solution and 4.9 mM potassium persulfate were mixed at a volume ratio of 1:1, followed by dark reaction overnight so that the resulting mixture turned blue-green. A working solution obtained by diluting the corresponding solution until an absorbance OD₇₃₄ reached about 0.7 was added with 10% of each lactic-acid bacteria lysate sample, followed by dark reaction for 10 min, after which the absorbance at a wavelength of 734 nm was measured, and each measured value was substituted into the following equation. ABTS radical-scavenging activity (%)={1−(OD _(sample) /OD _(control))}×100

The experimental results using ABTS are shown in FIG. 4C, and all of the K2, K6 and K8 strains exhibited radical-scavenging activity. Among these strains, K6 exhibited the greatest effect at 10 mg and above, and the next-greatest antioxidant activity was that of K8, followed by K2.

Even through these experimental results, BSH is involved in secondary bile salt metabolism, and thus, when the strains of the present disclosure are developed as products in a form able to ingest lactic-acid bacteria having BSH activity, it can be confirmed that the lactic-acid bacteria have bile resistance and are involved in the intermediate process of cholesterol metabolism of the host, thereby lowering the cholesterol of the host (Begley et al., 2006).

Moreover, the ability of the lactic-acid bacteria of the present disclosure to produce hydrogen peroxide suggests that it can inhibit the proliferation of vaginitis pathogens and opportunistic bacteria by helping antimicrobial activity. Also, it can be confirmed that, through the antioxidant effect of the lysate thereof, excess radicals generated in the affected area can be scavenged, thus having a positive effect on the recovery of the affected area.

Example 3. Confirmation of Antimicrobial Effect of Lactic-Acid Bacteria Against Vaginitis Pathogen Example 3-1. Confirmation of Growth of Lactic-Acid Bacteria Culture Solution

In order to measure the activity of the lactic-acid bacteria culture solution on inhibiting the growth of vaginitis pathogens, a 10-fold-concentrated cell-free culture supernatant (CFCS) was prepared. The culture solution of each of K2, K6 and K8 lactic-acid bacteria was centrifuged at 4,000 rpm for 25 min, thereby separating the cells of the lactic-acid bacteria and the culture supernatant from each other. The culture supernatant was filtered using a 0.2 μm pore syringe filter (Sartorius, Germany). The filtered culture supernatant was lyophilized and suspended in 1×PBS to afford a solution concentrated 10-fold compared to the volume of the initial culture solution. CA was inoculated at a concentration of 1×10⁵ CFU/ml and GV was inoculated at a concentration of 1×10⁶ CFU/ml under individual culture conditions. The CFCS of lactic-acid bacteria was added in a volume corresponding to 0.1 times the final volume to the vaginitis-pathogen-inoculated solution so as to reach 1×, and the test group not added with CFCS was used as a control. The mixed composition was cultured for 24 hr for CA and 48 hr for GV under individual vaginitis-pathogen culture conditions, and the absorbance was measured at a wavelength of OD₆₀₀. Based on the measured absorbance, growth inhibition was determined using the following cytotoxicity calculation equation. In this equation, OD_(control) represents the absorbance of the control, and OD_(cfcs) represents the absorbance of the CFCS-added group. Growth inhibition (%)=(OD _(control) −OD _(cfcs))/OD _(control)×100

As a result of treating the culture solution inoculated with each vaginitis pathogen with the CFCS of each of the lactic-acid bacteria at a 1× concentration, as shown in FIGS. 5A and 5B, after culture for 24 hr for CA, K2 exhibited growth inhibition of 87.05%, K6 exhibited growth inhibition of 82.11%, and K8 exhibited growth inhibition of 81.34%, and after culture for 48 hr for GV, K2 exhibited growth inhibition of 37.49%, K6 exhibited growth inhibition of 28.25%, and K8 exhibited growth inhibition of 44.60%.

** Candida albicans KCTC7678 (CA), Gardnerella vaginalis KCTC5096 (GV).

Example 3-2. Confirmation of Coaggregation

As another indicator of antimicrobial activity, the coaggregation of lactic-acid bacteria on the vaginitis pathogen was measured in accordance with the method suggested by Handley et al, 1987.

Briefly, lactic-acid bacteria and vaginitis pathogens were centrifuged at 13,000 rpm for 5 min and the supernatant was decanted, after which the precipitated microorganism cells were washed using 1×PBS. After washing was repeated twice, the microorganisms were each suspended using 1×PBS until an absorbance OD₆₀₀ of 1.0 was obtained. The lactic-acid bacteria suspension and the vaginitis pathogens were mixed at the same volume ratio, homogenized through vortexing, and allowed to stand, after which the supernatant of the mixed solution was carefully obtained at 1, 4, and 8 hr, and the absorbance thereof was measured. The suspension without mixing the microorganisms was used as a control. Based on the measured absorbance, coaggregation was calculated using the following equation. Here, OD_(patho) represents the absorbance of the vaginitis pathogen, OD_(LAB) represents the absorbance of the lactic-acid bacteria, and OD_(mix) represents the absorbance of the mixed solution of microorganisms. Coaggregation (%)={(OD _(patho) +OD _(LAB))/2−OD _(mix)}/(OD _(patho) +OD _(LAB))/2

Based on the results of evaluation of the coaggregation of the lactic-acid bacteria and the vaginitis pathogens as described above, as shown in FIGS. 5C and 5D, for CA at 8 hr, K2 exhibited coaggregation of 70.73%, K6 exhibited coaggregation of 58.57%, and K8 exhibited coaggregation of 57.88%, and for GV, K2 exhibited coaggregation of 32.72%, K6 exhibited coaggregation of 30.39%, and K8 exhibited coaggregation of 20.45%.

** Candida albicans KCTC7678 (CA), Gardnerella vaginalis KCTC5096 (GV).

Through these experimental results, effects of growth inhibition, coaggregation, and disinfection on CA and GV, which are the main causes of infectious vaginitis, were exhibited. Furthermore, through qualitative antimicrobial activity against seven types of opportunistic bacteria, it was found that the strains of the present disclosure are very effective at balancing vaginal microbiota and preventing infection. In particular, it can be confirmed that the material discharged out of the cells of the lactic-acid bacteria has an antimicrobial effect based on the growth inhibition of CA and GV by the K6 and K8 culture solutions, and also that the strains of the present disclosure can maximize the disinfection power and growth inhibitory effect through close contact with the corresponding pathogens based on the coaggregation ability.

Example 3-3. Confirmation of Disinfection Power Through Coculture

The anti-vaginitis effect of the lactic-acid bacteria of the present disclosure was tested for disinfection power on the vaginitis pathogen through coculture. In the anti-CA experiment, CA at a concentration of about 2.5×10⁶ CFU/ml and each of lactic-acid bacteria at a concentration of about 2.5×10⁶ CFU/ml were mixed at a ratio of 1:1, and coculture thereof was carried out in a culture medium of YM and MRS mixed at 1:1. In the anti-GV experiment, GV at a concentration of about 1.0×10⁸ CFU/ml and each of lactic-acid bacteria at a concentration of about 1.0×10⁸ CFU/ml were mixed at a ratio of 1:1 and then inoculated into a 10% horse-serum BHI broth. Each coculture experiment was conducted for 48 hr, and portions of the samples were collected initially and every 24 hr, and a viable cell count was taken through a serial dilution method and a plate-spreading method. In the anti-CA experiment, in order to measure CA alone, a YM plate medium containing ampicillin at a concentration of 100 μg/ml was used. In the anti-GV experiment, CFU was measured by distinguishing the colony forms between GV and lactic-acid bacteria using a 5% rabbit blood BHI plate medium.

In the coculture experiments of the lactic-acid bacteria and the vaginitis pathogens for 48 hr, as shown in FIGS. 6A and 6B, in the experimental groups in which K2, K6 and K8 were cocultured with CA, CA completely disappeared at 48 hr, and disinfection power at 24 hr was 99.03% in K2, 99.49% in K6, and 99.53% in K8.

In the experiment for GV, as shown in FIGS. 6C and 6D, disinfection power at 24 hr was 87.37% in K2, 92.50% in K6, and 93.71% in K8. Here, GV died at an average of about 90% after the initial 24 hr and then grew slowly, which is presumed to be due to a biofilm created for self-protection, which is one of the characteristics of GV. In the coculture experiments for CA and GV, it was confirmed that the disinfection values at 24 hr and at 48 hr were statistically significant compared to the initial value (OH) of each vaginitis pathogen.

Example 4. Vaginal Health Improvement Effect of Lactic-Acid Bacteria Example 4-1. Effect of Lactic-Acid Bacteria on Enhancing Innate Immunity

In order to measure the immunological effects of K2, K6 and K8 lactic-acid bacteria, a cytokine quantification experiment using cells was performed. The cells that were used were a mouse macrophage cell line RAW264.7, and the medium used for each cell experiment was a Gibco® Dulbecco's Modified Eagle Medium (DMEM, Gibco, USA) supplemented with 10% fetal bovine serum (Gibco, USA) and 1% penicillin/streptomycin cocktail (Sigma-Aldrich, Germany). RAW264.7 cells cultured at about 80-90% confluency before material treatment were recovered and seeded in an amount of 1×10⁶ cells per well of a 24-well plate. After seeding, culture was carried out in an environment of 37° C. and 5% CO₂ for 24 hr in order to realize attachment to the 24-well plate and stabilization thereof. Each well was treated with the lactic-acid bacteria lysate at concentrations of 100 μg/ml and 500 μg/ml, and 1 μg/ml of lipopolysaccharide (LPS, Sigma-Aldrich, Germany) was used as a positive control, and an experimental group not treated with any material was used as a negative control. The cells were cultured at 37° C. and 5% CO₂ for 24 hr after material treatment, and the cell culture solution was recovered, followed by enzyme-linked immunosorbent assay (ELISA) for IL-6 and TNF-α. Measurement was performed for IL-6 using a Mouse IL-6 Quantikine ELISA Kit (R&D systems, USA) and for TNF-α using a Mouse TNF-alpha Quantikine ELISA Kit (R&D systems, USA).

As a result, as shown in FIGS. 7A and 7B, when RAW264.7 cells were treated with the lactic-acid bacteria lysate, the concentrations of IL-6 and TNF-α were increased compared to the control. When using the K8 lysate at a concentration of 500 μg/ml, the amount of IL-6 that was produced was significantly reduced compared to when using the K8 lysate at a concentration of 100 μg/ml, and in the case of the K2 lysate, it was found that the amount of TNF-α that was produced was significantly increased with an increase in the concentration thereof. Overall, the amounts of IL-6 and TNF-α increased in all of the groups treated with the lactic-acid bacteria lysate, and the increase thereof was lower than that of the LPS-treated group.

Example 4-2. Effect of Lactic-Acid Bacteria on Inhibiting Inflammation

An experiment on inflammation inhibition was performed in the same manner as the test method for confirming the increase in innate immunity of Example 4-1, but an experimental group using both the lactic-acid bacteria lysate and LPS was further added. This experiment is intended to measure the ability to inhibit inflammation induced by LPS. To this end, each experimental group was cultured in an environment of 37° C. and 5% CO₂ for 24 hr after material treatment, the cell culture solution was recovered, and ELISA for IL-10 was performed using a mouse IL-10 Quantikine ELISA Kit (R&D systems, USA).

As a result, as shown in FIG. 8, when RAW264.7 cells were treated both with 1 μg/ml of LPS and with 100 μg/ml of each lactic-acid bacteria lysate, the concentration of IL-10 was significantly increased.

The groups further treated with the K2 lysate and the K6 lysate exhibited similarly increased IL-10 levels (about 1100-1150 μg/ml), and the group treated with the K8 lysate exhibited a relatively small increase in IL-10 (about 400 μg/ml) compared to the groups treated with the K2 lysate and the K6 lysate. However, compared to the group treated with LPS alone, all experimental groups treated with both lactic-acid bacteria and LPS exhibited a statistically significant increase.

From an immunological point of view, based on these experimental results, IL-6 and TNF-α were induced in the macrophage cell line RAW264.7 by all of the three types of lactic-acid bacteria lysates K2, K6 and K8, which is considered to demonstrate the effect of increasing innate immunity or enhancing immunity. IL-6 is a very important cytokine in immune regulation, having, for example, proinflammatory and anti-inflammatory effects, including activation of macrophages, induction and aggregation of neutrophils, and inflammatory response activity against invading pathogens (Scheller et al., 2001; Fielding et al., 2008). It is reasonable to consider this effect as an immunity-enhancing effect, rather than a pathological inflammatory response, based on low increase compared to IL-6 and TNF-α induced by LPS, which is a representative inflammatory substance. Moreover, the increased production of TNF-α, which is a cytokine that has effects such as anti-tumor effects, inhibition of fever and viral proliferation, activation of macrophages, and the like, also indicates that the lactic-acid bacteria of the present disclosure have an effect of increasing innate immunity (Vujanovic, 2011). In general, treatment with LPS causes inflammation and IL-10 is produced to control and inhibit the inflammatory response, and the amount of IL-10 that was produced was 2-5 times greater than that of IL-10 induced by LPS, based on which the lactic-acid bacteria are evaluated to be effective at inhibiting excessive inflammatory response.

Therefore, it is concluded that K2, K6 and K8 lactic-acid bacteria are strains that are safe, have antimicrobial activity against vaginitis pathogens, an antioxidant effect, and effects of increasing innate immunity and inhibiting inflammation, ultimately improving the urogenital health of the user.

Example 5. Whole-Genome Analysis of Lactic-Acid Bacteria

For whole-genome analysis of K2, K6 and K8 lactic-acid bacteria, genomic DNA was extracted, and the nucleotide sequence thereof was analyzed using Pacific Bioscience's Single-Molecule Real-Time (SMRT) sequencing technique. The nucleotide sequence data thus obtained was assembled using the Hierarchical Genome Assembly Process (HAGP) 2 protocol of SMRT analysis software v2.3.0, and Rapid Annotation using a Subsystem Technology (RAST) server (hypertext transfer protocol: rast.nmpdr.org/) was utilized for annotation. In addition, Average Nucleotide Identity (ANI) analysis was conducted in order to confirm the independence of three types of lactic-acid bacteria, and safety was verified once more from genetic information using PathoFinder 1.1 (hypertext transfer protocol: cge.cbs.dtu.dk/services/PathogenFinder/).

Based on the results of analyzing the whole genome of lactic-acid bacteria K2, K6 and K8, as is apparent from Tables 5 and 6 below, chromosomal DNA sizes thereof were different, and the number and size of plasmids were also different.

In ANI analysis conducted to confirm the independence of the three types of lactic-acid bacteria, K2 and K6 exhibited identity of 96.25%, K2 and K8 exhibited identity of 96.09%, and K6 and K8 exhibited identity of 99.92%, indicating that these belonged to the species Lactobacillus plantarum, but there was a difference of 0.08 to 3.91% therebetween.

TABLE 5 Lb. plantarum Lb. plantarum Lb. plantarum Strains ATG-K2 ATG-K6 ATG-K8 Chromosome (bp) 3,034,884 3,205,672 3,221,272 Plasmid 1 (bp) 61,159 56,833 54,492 Plasmid 2 (bp) 40,101 — — Plasmid 3 (bp) 38,954 — —

TABLE 6 Results of whole-genome analysis of each of Lactobacillus plantarum K2, K6 and K8 strains Attribute ATG-K2 ATG-K6 ATG-K8 Total genome size (bp) 3,175,098 3,262,505 3,275,764 Chromosome size 3,034,884 3,205,672 3,221,272 Plasmid number 3 1 1 DNA G + C(%) 45.19 44.54 44.54 Total genes 3,114 3,178 3,186 Protein coding genes 2,857 2,999 2,999 rRNA genes 16 16 16 tRNA genes 65 67 67 ncRNA genes 4 4 4 Pseudo genes 172 92 100 GenBank accession GCA_003597635.1 GCA_003597595.1 GCA_003597615.1

Thereafter, based on the results of annotation through the RAST server using the genome information described above, it was confirmed that the gene compositions of individual strains were also different, as shown in Table 7 below. The K2 lactic-acid bacteria had 49 genes associated with the cell wall and capsule, whereas the K6 and K8 lactic-acid bacteria had 71 genes. In the case of genes associated with carbohydrates, the K2 lactic-acid bacteria had 215 genes, the K6 lactic-acid bacteria had 235 genes, and the K8 lactic-acid bacteria had 245 genes. The difference therebetween appears to be that the three types of lactic-acid bacteria belong to the same species but exhibit different growth rates or functions.

TABLE 7 Gene composition of each of Lactobacillus plantarum K2, K6 and K8 strains Target gene ATG-K2 G-K6 G-K8 Cofactors, Vitamins, Prosthetic 103 117 102 Groups, Pigments Cell Wall and Capsule 49 71 71 Virulence, Disease and Defense 42 39 39 Potassium Metabolism 6 5 5 Photosynthesis 0 0 0 Miscellaneous 18 18 18 Phages, Prophages, Transposable 10 11 11 Elements, Plasmids Membrane Transport 55 48 48 Iron Acquisition and Metabolism 5 5 5 RNA Metabolism 41 39 39 Nucleosides and Nucleotides 88 88 89 Protein Metabolism 146 148 148 Cell Division and Cell Cycle 4 4 4 Motility and Chemotaxis 0 0 0 Regulation and Cell Signaling 34 27 29 Secondary Metabolism 4 4 4 DMA Metabolism. 58 55 55 Fatty Acids, Lipids, and Isoprenoids 36 35 37 Nitrogen Metabolism 0 0 0 Dormancy and Sporulation 6 6 6 Respiration 17 15 16 Stress Response 19 21 21 Metabolism of Aromatic Compounds 5 8 8 Amino Acids and Derivatives 196 189 190 Sulfur Metabolism 3 3 3 Phosphorus Metabolism 35 33 33 Carbohydrates 215 235 246 Total identified gene percentage in 29% 26% 28% RAST server subsystem database

Formulation Example 1. Pharmaceutical Formulation Formulation Example 1-1. Preparation of Tablet

200 g of any one of Lactobacillus plantarum K2, K6 and K8 of the present disclosure was mixed with 175.9 g of lactose, 180 g of potato starch and 32 g of colloidal silicic acid. The resulting mixture was added with a 10% gelatin solution, pulverized, and passed through a 14-mesh sieve. The resulting product was dried and added with 160 g of potato starch, 50 g of talc and 5 g of magnesium stearate, and the resulting mixture was manufactured into tablets.

Formulation Example 2. Preparation of Food Formulation Example 2-1. Preparation of Cooking Seasoning

A cooking seasoning for health improvement was manufactured by adding 1 wt % of any one of the Lactobacillus plantarum K2, K6 and K8 lactic-acid bacteria of the present disclosure to a cooking seasoning.

Formulation Example 2-2. Preparation of Dairy Products

Various dairy products such as butter and ice cream were manufactured using milk containing 0.1 wt % of any one of the Lactobacillus plantarum K2, K6 and K8 lactic-acid bacteria of the present disclosure.

Formulation Example 2-5. Preparation of Vegetable Juice

A vegetable juice for health improvement was manufactured by adding 0.5 g of any one of the Lactobacillus plantarum K2, K6 and K8 lactic-acid bacteria of the present disclosure to 1,000 ml of tomato juice or carrot juice.

Formulation Example 2-6. Preparation of Fruit Juice

A fruit juice for health improvement was manufactured by adding 0.1 g of any one of the Lactobacillus plantarum K2, K6 and K8 lactic-acid bacteria of the present disclosure to 1,000 ml of apple juice or grape juice.

[Depositary Authority]

Name of Depositary Authority: Korean Collection for Type Cultures

Accession number: KCTC13577BP

Accession date: 20180710

Name of Depositary Authority: Korean Collection for Type Cultures

Accession number: KCTC13570BP

Accession date: 20180703

Name of Depositary Authority: Korean Collection for Type Cultures

Accession number: KCTC13571BP

Accession date: 20180703 

The invention claimed is:
 1. A method of preventing or treating vaginitis in a mammalian subject in need thereof comprising administering to the subject a composition comprising an amount of the isolated Lactobacillus plantarum ATG-K2 strain having the accession number KCTC 13577BP and comprising the 16S rRNA nucleotide sequence of SEQ ID NO:
 1. 2. The method of claim 1, wherein the Lactobacillus plantarum ATG-K2 strain has antimicrobial activity against at least one vaginitis pathogen selected from the group consisting of Candida albicans and Gardnerella vaginalis.
 3. The method of claim 1, wherein the Lactobacillus plantarum ATG-K2 strain has antimicrobial activity against at least one bacterium selected from the group consisting of Staphylococcus aureus, Listeria monocytogenes, Streptococcus mutans, Streptococcus salivarius, Escherichia coli, Pseudomonas aeruginosa, and Cronobacter sakazakii.
 4. The method of claim 1, wherein the Lactobacillus plantarum ATG-K2 strain does not cause hemolysis and does not produce histamine, tyramine, putrescine, and cadaverine.
 5. The method of claim 1, wherein the Lactobacillus plantarum ATG-K2 strain has bile salt hydrolase activity, ability to produce hydrogen peroxide, or antioxidant activity.
 6. The method of claim 1, wherein the Lactobacillus plantarum ATG-K2 strain is not resistant to ampicillin, vancomycin, gentamicin, kanamycin, streptomycin, clindamycin, erythromycin, tetracycline, and chloramphenicol.
 7. The method of claim 1, wherein the administering of the composition increases an amount of interleukin-6 (IL-6), tumor necrosis factor-alpha (TNF-alpha), and interleukin-10 (IL-10) in the subject compared to a corresponding subject not administered with the composition. 